Physics
Which statement best describes an igneous intrusion?

Magma is injected into surrounding rock forming an igneous intrusive
Igneous intrusion for when ice crystals splash into lava
Magma is exported to an open area and forms iron
Magma explodes to the surface and forms a smooth outer layer of rock

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals have higher thermal capacity than plastics
plastics have a higher thermal conductivity than metals
plastics have a lower density than metals
metals are good conductor of heat

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